Okay, that clarifies the situation--much better. I still don't know the
answer, but someone coming along might be able to figure it out now.
My wild guess would be that this is a font issue--what happens if you
randomly select some text in a comment and cycle through a few font
changes? try Arial Unicode and Times New Roman first, and I would
experiment on a COPY of the doc. Can you get it showing something
readable? Is it possible that the comments are using a non-Latin
alphabet or font that you don't have on your machine? Are they from a
multi-lingual user?
My other wild guess would be that this a screendraw issue caused by the
balloons--what happens if you choose Show Reviewing Pane on the
Reviewing toolbar? Does that get you readable comments?
And hey, wild guess #3--it could be corruption. Try round-tripping it
through HTML as described here:
http://www.mvps.org/word/FAQs/AppErrors/CorruptDoc.htm